Why blacklist at all? That site is so restrictive. You can register there as a new user but that does not mean you will be allowed to login! No, you have to go kiss someone's ass first I believe.
Even Amibay, with all of its rules, as least makes it easy for you to become an active user.
I'm fine with Amiga.org and EAB.
Y'all do things funny over there in the UK. Why would someone blacklist an entire ISP, not just one particular IP address?
Out of idle curiosity, how many ISP's do you have, anyway? Where I'm at in the US you're lucky if you get two choices (either the cable company or the phone company). And many places don't even get that many choices, lol. 
